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author | Christophe Leroy | 2023-02-01 11:04:25 +0100 |
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committer | Greg Kroah-Hartman | 2023-03-17 08:50:30 +0100 |
commit | 5b5fab270f4db7d19c8fcb057f3e22f5ee798617 (patch) | |
tree | 8374a8be2687b5488ff7f4e2b47d0a1ff9bcaf9c /scripts/min-tool-version.sh | |
parent | 71e9501458aa3e0d74026aed250c02da7bece023 (diff) |
powerpc/bpf/32: Only set a stack frame when necessary
[ Upstream commit d084dcf256bc4565b4b1af9b00297ac7b51c7049 ]
Until now a stack frame was set at all time due to the need
to keep tail call counter in the stack.
But since commit 89d21e259a94 ("powerpc/bpf/32: Fix Oops on tail call
tests") the tail call counter is passed via register r4. It is therefore
not necessary anymore to have a stack frame for that.
Just like PPC64, implement bpf_has_stack_frame() and only sets the frame
when needed.
The difference with PPC64 is that PPC32 doesn't have a redzone, so
the stack is required as soon as non volatile registers are used or
when tail call count is set up.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Fix commit reference in change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/62d7b654a3cfe73d998697cb29bbc5ffd89bfdb1.1675245773.git.christophe.leroy@csgroup.eu
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'scripts/min-tool-version.sh')
0 files changed, 0 insertions, 0 deletions