linux.git/arch/csky/kernel/vdso.c, branch for-next

csky/vdso: Remove arch_vma_name()

2024-11-02T11:37:32+00:00

All callers of arch_vma_name() also get the name via vm_ops, which for
these VMAs will use the name from 'struct vma_special_mapping'.
Therefore the custom implementation is unnecessary and can be removed in
favor of the default implementation from kernel/signal.c.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-2-b64f0842d512@linutronix.de

csky/vdso: Remove gettimeofday() and friends from VDSO

2024-11-02T11:37:32+00:00

The time-related VDSO functionality was introduced in 2021 in
commit 87f3248cdb9a ("csky: Reconstruct VDSO framework") and
commit 0d3b051adbb7 ("csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO").

However the corresponding aux-vector entry AT_SYSINFO_EHDR was never
wired up, making these functions impossible to test or use.

The VDSO itself is kept as it also provides rt_sigreturn which is
exposed differently to userspace.

Signed-off-by: Thomas Weißschuh 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-1-b64f0842d512@linutronix.de

mm: remove legacy install_special_mapping() code

2024-09-02T03:26:13+00:00

All relevant architectures had already been converted to the new interface
(which just has an underscore in front of the name - not very imaginative
naming), this just force-converts the stragglers.

The modern interface is almost identical to the old one, except instead of
the page pointer it takes a "struct vm_special_mapping" that describes the
mapping (and contains the page pointer as one member), and it returns the
resulting 'vma' instead of just the error code.

Getting rid of the old interface also gets rid of some special casing,
which had caused problems with the mremap extensions to "struct
vm_special_mapping".

[akpm@linux-foundation.org: coding-style cleanups]
Link: https://lkml.kernel.org/r/CAHk-=whvR+z=0=0gzgdfUiK70JTa-=+9vxD-4T=3BagXR6dciA@mail.gmail.comTested-by: Rob Landley  # arch/sh/
Link: https://lore.kernel.org/all/20240819195120.GA1113263@thelio-3990X/
Signed-off-by: Linus Torvalds 
Cc: Nathan Chancellor 
Cc: Michael Ellerman 
Cc: Anton Ivanov 
Cc: Brian Cain 
Cc: Christophe Leroy 
Cc: Dinh Nguyen 
Cc: Guo Ren 
Cc: Jeff Xu 
Cc: Johannes Berg 
Cc: John Paul Adrian Glaubitz 
Cc: Liam R. Howlett 
Cc: Nicholas Piggin 
Cc: Pedro Falcato 
Cc: Richard Weinberger 
Cc: Rich Felker 
Cc: Rob Landley 
Cc: Yoshinori Sato 
Signed-off-by: Andrew Morton

csky/vdso: Use generic union vdso_data_store

2024-02-20T19:56:01+00:00

There is already a generic union definition for vdso_data_store in the vdso
datapage header.

Use this definition to prevent code duplication.

Signed-off-by: Anna-Maria Behnsen 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Vincenzo Frascino 
Reviewed-by: Kees Cook 
Acked-by: Guo Ren 
Link: https://lore.kernel.org/r/20240219153939.75719-11-anna-maria@linutronix.de

csky/vdso: Remove superfluous ifdeffery

2024-02-20T19:56:00+00:00

CSKY selects GENERIC_TIME_VSYSCALL. GENERIC_TIME_VSYSCALL dependent
ifdeffery is superfluous. Clean it up.

Signed-off-by: Anna-Maria Behnsen 
Signed-off-by: Thomas Gleixner 
Reviewed-by: Vincenzo Frascino 
Reviewed-by: Kees Cook 
Acked-by: Guo Ren 
Link: https://lore.kernel.org/r/20240219153939.75719-4-anna-maria@linutronix.de

csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO

2021-02-27T08:35:09+00:00

It could help to reduce the latency of the time-related functions
in user space.

We have referenced arm's and riscv's implementation for the patch.

Signed-off-by: Guo Ren 
Cc: Vincent Chen 
Cc: Arnd Bergmann

csky: Reconstruct VDSO framework

2021-01-12T01:52:41+00:00

Reconstruct vdso framework to support future vsyscall,
vgettimeofday features. These are very important features to reduce
system calls into the kernel for performance improvement.

The patch is reference RISC-V's

Signed-off-by: Guo Ren 
Cc: Palmer Dabbelt

mmap locking API: use coccinelle to convert mmap_sem rwsem call sites

2020-06-09T16:39:14+00:00

This change converts the existing mmap_sem rwsem calls to use the new mmap
locking API instead.

The change is generated using coccinelle with the following rule:

// spatch --sp-file mmap_lock_api.cocci --in-place --include-headers --dir .

@@
expression mm;
@@
(
-init_rwsem
+mmap_init_lock
|
-down_write
+mmap_write_lock
|
-down_write_killable
+mmap_write_lock_killable
|
-down_write_trylock
+mmap_write_trylock
|
-up_write
+mmap_write_unlock
|
-downgrade_write
+mmap_write_downgrade
|
-down_read
+mmap_read_lock
|
-down_read_killable
+mmap_read_lock_killable
|
-down_read_trylock
+mmap_read_trylock
|
-up_read
+mmap_read_unlock
)
-(&mm->mmap_sem)
+(mm)

Signed-off-by: Michel Lespinasse 
Signed-off-by: Andrew Morton 
Reviewed-by: Daniel Jordan 
Reviewed-by: Laurent Dufour 
Reviewed-by: Vlastimil Babka 
Cc: Davidlohr Bueso 
Cc: David Rientjes 
Cc: Hugh Dickins 
Cc: Jason Gunthorpe 
Cc: Jerome Glisse 
Cc: John Hubbard 
Cc: Liam Howlett 
Cc: Matthew Wilcox 
Cc: Peter Zijlstra 
Cc: Ying Han 
Link: http://lkml.kernel.org/r/20200520052908.204642-5-walken@google.com
Signed-off-by: Linus Torvalds

csky: VDSO and rt_sigreturn

2018-10-25T16:54:22+00:00

This patch adds files related to VDSO and our VDSO only support
rt_sigreturn.

Signed-off-by: Guo Ren 
Reviewed-by: Arnd Bergmann