iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

powerpc/64: ret_from_fork avoid restoring regs twice

Browse Source 
If the system call return path always restores NVGPRs then there is no
need for ret_from_fork to do it. The HANDLER_RESTORE_NVGPRS does the
right thing for this.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230325122904.2375060-5-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2023-03-25 22:29:00 +10:00 committed by Michael Ellerman
parent af5ca9d5c8
commit 5088a6246b
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/kernel/interrupt_64.S
View File

@ -728,14 +728,14 @@ DEFINE_FIXED_SYMBOL(__end_soft_masked, text)
#ifdef CONFIG_PPC_BOOK3S
_GLOBAL(ret_from_fork_scv)
bl schedule_tail
REST_NVGPRS(r1)
HANDLER_RESTORE_NVGPRS()
li r3,0 /* fork() return value */
b .Lsyscall_vectored_common_exit
#endif
_GLOBAL(ret_from_fork)
bl schedule_tail
REST_NVGPRS(r1)
HANDLER_RESTORE_NVGPRS()
li r3,0 /* fork() return value */
b .Lsyscall_exit