Commit 45b30faf authored Jun 07, 2021 by Christophe Leroy Committed by Michael Ellerman Jun 17, 2021

powerpc: Define empty_zero_page[] in C



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 5227cfa7 ("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

parent a1ea0ca8

arch/powerpc/kernel/head_40x.S

+0 −4

Original line number	Diff line number	Diff line
		@@ -709,10 +709,6 @@ _GLOBAL(abort)
		.align 12
		.globl sdata
		sdata:
		.globl empty_zero_page
		empty_zero_page:
		.space 4096
		EXPORT_SYMBOL(empty_zero_page)
		.globl swapper_pg_dir
		swapper_pg_dir:
		.space PGD_TABLE_SIZE

arch/powerpc/kernel/head_44x.S

+0 −4

Original line number	Diff line number	Diff line
		@@ -1241,10 +1241,6 @@ head_start_common:
		.align PAGE_SHIFT
		.globl sdata
		sdata:
		.globl empty_zero_page
		empty_zero_page:
		.space PAGE_SIZE
		EXPORT_SYMBOL(empty_zero_page)

		/*
		* To support >32-bit physical addresses, we use an 8KB pgdir.

arch/powerpc/kernel/head_64.S

+0 −5

Original line number	Diff line number	Diff line
		@@ -1012,8 +1012,3 @@ start_here_common:
		.globl swapper_pg_dir
		swapper_pg_dir:
		.space PGD_TABLE_SIZE

		.globl empty_zero_page
		empty_zero_page:
		.space PAGE_SIZE
		EXPORT_SYMBOL(empty_zero_page)

arch/powerpc/kernel/head_8xx.S

+0 −6

Original line number	Diff line number	Diff line
		@@ -795,12 +795,6 @@ _GLOBAL(mmu_pin_tlb)
		.data
		.globl sdata
		sdata:
		.globl empty_zero_page
		.align PAGE_SHIFT
		empty_zero_page:
		.space PAGE_SIZE
		EXPORT_SYMBOL(empty_zero_page)

		.globl swapper_pg_dir
		swapper_pg_dir:
		.space PGD_TABLE_SIZE

arch/powerpc/kernel/head_book3s_32.S

+0 −5

Original line number	Diff line number	Diff line
		@@ -1216,11 +1216,6 @@ setup_usbgecko_bat:
		.data
		.globl sdata
		sdata:
		.globl empty_zero_page
		empty_zero_page:
		.space 4096
		EXPORT_SYMBOL(empty_zero_page)

		.globl swapper_pg_dir
		swapper_pg_dir:
		.space PGD_TABLE_SIZE