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| author | Nicholas Piggin <npiggin@gmail.com> | 2022-11-27 22:49:40 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-12-02 17:54:09 +1100 |
| commit | 90f1b43196c5e79f6c986a359011a19857984c27 (patch) | |
| tree | af5ff5534895e1da6b5672b58a7292726e5ba8d0 /arch/powerpc/kernel/head_64.S | |
| parent | 4cefb0f6c555971b3e6544a9b15470f9d1f12089 (diff) | |
| download | lwn-90f1b43196c5e79f6c986a359011a19857984c27.tar.gz lwn-90f1b43196c5e79f6c986a359011a19857984c27.zip | |
powerpc: allow minimum sized kernel stack frames
This affects only 64-bit ELFv2 kernels, and reduces the minimum
asm-created stack frame size from 112 to 32 byte on those kernels.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221127124942.1665522-16-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/head_64.S')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index dedcc6fe2263..b513d13bf79e 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -424,7 +424,7 @@ generic_secondary_common_init: /* Create a temp kernel stack for use before relocation is on. */ ld r1,PACAEMERGSP(r13) - subi r1,r1,STACK_FRAME_OVERHEAD + subi r1,r1,STACK_FRAME_MIN_SIZE /* See if we need to call a cpu state restore handler */ LOAD_REG_ADDR(r23, cur_cpu_spec) @@ -780,7 +780,7 @@ _GLOBAL(pmac_secondary_start) /* Create a temp kernel stack for use before relocation is on. */ ld r1,PACAEMERGSP(r13) - subi r1,r1,STACK_FRAME_OVERHEAD + subi r1,r1,STACK_FRAME_MIN_SIZE b __secondary_start @@ -958,7 +958,7 @@ start_here_multiplatform: LOAD_REG_IMMEDIATE(r1,THREAD_SIZE) add r1,r3,r1 li r0,0 - stdu r0,-STACK_FRAME_OVERHEAD(r1) + stdu r0,-STACK_FRAME_MIN_SIZE(r1) /* * Do very early kernel initializations, including initial hash table |