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| author | Nicholas Piggin <npiggin@gmail.com> | 2022-09-26 13:40:53 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-09-28 19:22:12 +1000 |
| commit | 17773afdcd1589c5925a984f512330410cb2ba4f (patch) | |
| tree | 0f209601034524b3258a4280e1b293c4581218da /arch/powerpc/kernel/head_64.S | |
| parent | 4b2a9315f20d98576e25c9e4572e9a8e028d7aa2 (diff) | |
| download | lwn-17773afdcd1589c5925a984f512330410cb2ba4f.tar.gz lwn-17773afdcd1589c5925a984f512330410cb2ba4f.zip | |
powerpc/64: use 32-bit immediate for STACK_FRAME_REGS_MARKER
Using a 32-bit constant for this marker allows it to be loaded with
two ALU instructions, like 32-bit. This avoids a TOC entry and a
TOC load that depends on the r2 value that has just been loaded from
the PACA.
This changes the value for 32-bit as well, so both have the same
value in the low 4 bytes and 64-bit has 0 in the top bytes.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220926034057.2360083-2-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/kernel/head_64.S')
| -rw-r--r-- | arch/powerpc/kernel/head_64.S | 7 |
1 files changed, 0 insertions, 7 deletions
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S index da544ea0ce01..c79da95dfd2e 100644 --- a/arch/powerpc/kernel/head_64.S +++ b/arch/powerpc/kernel/head_64.S @@ -192,13 +192,6 @@ __secondary_hold: #endif CLOSE_FIXED_SECTION(first_256B) -/* This value is used to mark exception frames on the stack. */ - .section ".toc","aw" -/* This value is used to mark exception frames on the stack. */ -exception_marker: - .tc ID_EXC_MARKER[TC],STACK_FRAME_REGS_MARKER - .previous - /* * On server, we include the exception vectors code here as it * relies on absolute addressing which is only possible within |