powerpc: Define empty_zero_page[] in C

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At the time being, empty_zero_page[] is defined in each
platform head.S.

Define it in mm/mem.c instead, and put it in BSS section instead
of the DATA section. Commit 5227cfa71f ("arm64: mm: place
empty_zero_page in bss") explains why it is interesting to have
it in BSS.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5838caffa269e0957c5a50cc85477876220298b0.1623063174.git.christophe.leroy@csgroup.eu

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This commit is contained in:

Christophe Leroy 2021-06-07 10:56:04 +00:00 • committed by Michael Ellerman

parent a1ea0ca8a6

commit 45b30fafe5

7 changed files with 3 additions and 28 deletions

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4

arch/powerpc/kernel/head_40x.S

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arch/powerpc/kernel/head_44x.S

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arch/powerpc/kernel/head_64.S

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arch/powerpc/kernel/head_8xx.S

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arch/powerpc/kernel/head_book3s_32.S

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arch/powerpc/kernel/head_fsl_booke.S

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arch/powerpc/mm/mem.c

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