linux-stable.git/mm/vmalloc.c, branch v5.8.4

mm/vunmap: add cond_resched() in vunmap_pmd_range

2020-08-26T09:48:59+00:00

commit e47110e90584a22e9980510b00d0dfad3a83354e upstream.

Like zap_pte_range add cond_resched so that we can avoid softlockups as
reported below.  On non-preemptible kernel with large I/O map region (like
the one we get when using persistent memory with sector mode), an unmap of
the namespace can report below softlockups.

22724.027334] watchdog: BUG: soft lockup - CPU#49 stuck for 23s! [ndctl:50777]
 NIP [c0000000000dc224] plpar_hcall+0x38/0x58
 LR [c0000000000d8898] pSeries_lpar_hpte_invalidate+0x68/0xb0
 Call Trace:
    flush_hash_page+0x114/0x200
    hpte_need_flush+0x2dc/0x540
    vunmap_page_range+0x538/0x6f0
    free_unmap_vmap_area+0x30/0x70
    remove_vm_area+0xfc/0x140
    __vunmap+0x68/0x270
    __iounmap.part.0+0x34/0x60
    memunmap+0x54/0x70
    release_nodes+0x28c/0x300
    device_release_driver_internal+0x16c/0x280
    unbind_store+0x124/0x170
    drv_attr_store+0x44/0x60
    sysfs_kf_write+0x64/0x90
    kernfs_fop_write+0x1b0/0x290
    __vfs_write+0x3c/0x70
    vfs_write+0xd8/0x260
    ksys_write+0xdc/0x130
    system_call+0x5c/0x70

Reported-by: Harish Sriram 
Signed-off-by: Aneesh Kumar K.V 
Signed-off-by: Andrew Morton 
Reviewed-by: Andrew Morton 
Cc: 
Link: http://lkml.kernel.org/r/20200807075933.310240-1-aneesh.kumar@linux.ibm.com
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

mm: remove vmalloc_exec

2020-06-26T07:27:38+00:00

Merge vmalloc_exec into its only caller.  Note that for !CONFIG_MMU
__vmalloc_node_range maps to __vmalloc, which directly clears the
__GFP_HIGHMEM added by the vmalloc_exec stub anyway.

Link: http://lkml.kernel.org/r/20200618064307.32739-4-hch@lst.de
Signed-off-by: Christoph Hellwig 
Reviewed-by: David Hildenbrand 
Acked-by: Peter Zijlstra (Intel) 
Cc: Catalin Marinas 
Cc: Dexuan Cui 
Cc: Jessica Yu 
Cc: Vitaly Kuznetsov 
Cc: Wei Liu 
Cc: Will Deacon 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/vmalloc.c: fix a warning while make xmldocs

2020-06-26T07:27:37+00:00

This patch fixes following warning while "make xmldocs"

  mm/vmalloc.c:1877: warning: Excess function parameter 'prot' description in 'vm_map_ram'

This warning started since commit d4efd79a81ab ("mm: remove the prot
argument from vm_map_ram").

Link: http://lkml.kernel.org/r/20200622152850.140871-1-standby24x7@gmail.com
Fixes: d4efd79a81ab ("mm: remove the prot argument from vm_map_ram")
Signed-off-by: Masanari Iida 
Reviewed-by: Andrew Morton 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/vmalloc: fix a typo in comment

2020-06-05T02:06:21+00:00

There is a typo in comment, fix it.
"nother" -> "another"

Signed-off-by: Jeongtae Park 
Signed-off-by: Andrew Morton 
Reviewed-by: David Hildenbrand 
Cc: Andrey Ryabinin 
Cc: Christoph Hellwig 
Link: http://lkml.kernel.org/r/20200604185239.20765-1-jtp.park@samsung.com
Signed-off-by: Linus Torvalds

mm: remove vmalloc_sync_(un)mappings()

2020-06-02T17:59:12+00:00

These functions are not needed anymore because the vmalloc and ioremap
mappings are now synchronized when they are created or torn down.

Remove all callers and function definitions.

Signed-off-by: Joerg Roedel 
Signed-off-by: Andrew Morton 
Tested-by: Steven Rostedt (VMware) 
Acked-by: Andy Lutomirski 
Acked-by: Peter Zijlstra (Intel) 
Cc: Arnd Bergmann 
Cc: Christoph Hellwig 
Cc: Dave Hansen 
Cc: "H . Peter Anvin" 
Cc: Ingo Molnar 
Cc: Matthew Wilcox (Oracle) 
Cc: Michal Hocko 
Cc: "Rafael J. Wysocki" 
Cc: Thomas Gleixner 
Cc: Vlastimil Babka 
Link: http://lkml.kernel.org/r/20200515140023.25469-7-joro@8bytes.org
Signed-off-by: Linus Torvalds

mm/vmalloc: track which page-table levels were modified

2020-06-02T17:59:11+00:00

Track at which levels in the page-table entries were modified by
vmap/vunmap.

After the page-table has been modified, use that information do decide
whether the new arch_sync_kernel_mappings() needs to be called.

[akpm@linux-foundation.org: map_kernel_range_noflush() needs the arch_sync_kernel_mappings() call]
Signed-off-by: Joerg Roedel 
Signed-off-by: Andrew Morton 
Acked-by: Andy Lutomirski 
Acked-by: Peter Zijlstra (Intel) 
Cc: Arnd Bergmann 
Cc: Christoph Hellwig 
Cc: Dave Hansen 
Cc: "H . Peter Anvin" 
Cc: Ingo Molnar 
Cc: Matthew Wilcox (Oracle) 
Cc: Michal Hocko 
Cc: "Rafael J. Wysocki" 
Cc: Steven Rostedt (VMware) 
Cc: Thomas Gleixner 
Cc: Vlastimil Babka 
Link: http://lkml.kernel.org/r/20200515140023.25469-3-joro@8bytes.org
Signed-off-by: Linus Torvalds

mm: remove vmalloc_user_node_flags

2020-06-02T17:59:11+00:00

Open code it in __bpf_map_area_alloc, which is the only caller.  Also
clean up __bpf_map_area_alloc to have a single vmalloc call with slightly
different flags instead of the current two different calls.

For this to compile for the nommu case add a __vmalloc_node_range stub to
nommu.c.

[akpm@linux-foundation.org: fix nommu.c build]
Signed-off-by: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Acked-by: Peter Zijlstra (Intel) 
Acked-by: Johannes Weiner 
Cc: Christian Borntraeger 
Cc: Christophe Leroy 
Cc: Daniel Vetter 
Cc: David Airlie 
Cc: Gao Xiang 
Cc: Greg Kroah-Hartman 
Cc: Haiyang Zhang 
Cc: "K. Y. Srinivasan" 
Cc: Laura Abbott 
Cc: Mark Rutland 
Cc: Michael Kelley 
Cc: Minchan Kim 
Cc: Nitin Gupta 
Cc: Robin Murphy 
Cc: Sakari Ailus 
Cc: Stephen Hemminger 
Cc: Sumit Semwal 
Cc: Wei Liu 
Cc: Benjamin Herrenschmidt 
Cc: Catalin Marinas 
Cc: Heiko Carstens 
Cc: Paul Mackerras 
Cc: Vasily Gorbik 
Cc: Will Deacon 
Cc: Stephen Rothwell 
Link: http://lkml.kernel.org/r/20200414131348.444715-27-hch@lst.de
Signed-off-by: Linus Torvalds

mm: switch the test_vmalloc module to use __vmalloc_node

2020-06-02T17:59:11+00:00

No need to export the very low-level __vmalloc_node_range when the test
module can use a slightly higher level variant.

[akpm@linux-foundation.org: add missing `node' arg]
[akpm@linux-foundation.org: fix riscv nommu build]
Signed-off-by: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Acked-by: Peter Zijlstra (Intel) 
Cc: Christian Borntraeger 
Cc: Christophe Leroy 
Cc: Daniel Vetter 
Cc: David Airlie 
Cc: Gao Xiang 
Cc: Greg Kroah-Hartman 
Cc: Haiyang Zhang 
Cc: Johannes Weiner 
Cc: "K. Y. Srinivasan" 
Cc: Laura Abbott 
Cc: Mark Rutland 
Cc: Michael Kelley 
Cc: Minchan Kim 
Cc: Nitin Gupta 
Cc: Robin Murphy 
Cc: Sakari Ailus 
Cc: Stephen Hemminger 
Cc: Sumit Semwal 
Cc: Wei Liu 
Cc: Benjamin Herrenschmidt 
Cc: Catalin Marinas 
Cc: Heiko Carstens 
Cc: Paul Mackerras 
Cc: Vasily Gorbik 
Cc: Will Deacon 
Link: http://lkml.kernel.org/r/20200414131348.444715-26-hch@lst.de
Signed-off-by: Linus Torvalds

mm: remove __vmalloc_node_flags_caller

2020-06-02T17:59:11+00:00

Just use __vmalloc_node instead which gets and extra argument.  To be able
to to use __vmalloc_node in all caller make it available outside of
vmalloc and implement it in nommu.c.

[akpm@linux-foundation.org: fix nommu build]
Signed-off-by: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Acked-by: Peter Zijlstra (Intel) 
Cc: Christian Borntraeger 
Cc: Christophe Leroy 
Cc: Daniel Vetter 
Cc: David Airlie 
Cc: Gao Xiang 
Cc: Greg Kroah-Hartman 
Cc: Haiyang Zhang 
Cc: Johannes Weiner 
Cc: "K. Y. Srinivasan" 
Cc: Laura Abbott 
Cc: Mark Rutland 
Cc: Michael Kelley 
Cc: Minchan Kim 
Cc: Nitin Gupta 
Cc: Robin Murphy 
Cc: Sakari Ailus 
Cc: Stephen Hemminger 
Cc: Sumit Semwal 
Cc: Wei Liu 
Cc: Benjamin Herrenschmidt 
Cc: Catalin Marinas 
Cc: Heiko Carstens 
Cc: Paul Mackerras 
Cc: Vasily Gorbik 
Cc: Will Deacon 
Cc: Stephen Rothwell 
Link: http://lkml.kernel.org/r/20200414131348.444715-25-hch@lst.de
Signed-off-by: Linus Torvalds

mm: remove both instances of __vmalloc_node_flags

2020-06-02T17:59:11+00:00

The real version just had a few callers that can open code it and remove
one layer of indirection.  The nommu stub was public but only had a single
caller, so remove it and avoid a CONFIG_MMU ifdef in vmalloc.h.

Signed-off-by: Christoph Hellwig 
Signed-off-by: Andrew Morton 
Acked-by: Peter Zijlstra (Intel) 
Cc: Christian Borntraeger 
Cc: Christophe Leroy 
Cc: Daniel Vetter 
Cc: David Airlie 
Cc: Gao Xiang 
Cc: Greg Kroah-Hartman 
Cc: Haiyang Zhang 
Cc: Johannes Weiner 
Cc: "K. Y. Srinivasan" 
Cc: Laura Abbott 
Cc: Mark Rutland 
Cc: Michael Kelley 
Cc: Minchan Kim 
Cc: Nitin Gupta 
Cc: Robin Murphy 
Cc: Sakari Ailus 
Cc: Stephen Hemminger 
Cc: Sumit Semwal 
Cc: Wei Liu 
Cc: Benjamin Herrenschmidt 
Cc: Catalin Marinas 
Cc: Heiko Carstens 
Cc: Paul Mackerras 
Cc: Vasily Gorbik 
Cc: Will Deacon 
Link: http://lkml.kernel.org/r/20200414131348.444715-24-hch@lst.de
Signed-off-by: Linus Torvalds