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powerpc/build: move .data.rel.ro, .sdata2 to read-only

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.sdata2 is a readonly small data section for ppc32, and .data.rel.ro
is data that needs relocating but is read-only after that so these
can both be moved to the read only memory region.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220916040755.2398112-5-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2022-09-16 14:07:52 +10:00 committed by Michael Ellerman
parent f21ba4499a
commit b6adc6d6d3
1 changed files with 14 additions and 10 deletions
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24
arch/powerpc/kernel/vmlinux.lds.S
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@ -135,6 +135,16 @@ SECTIONS
/* Read-only data */
RO_DATA(PAGE_SIZE)
#ifdef CONFIG_PPC32
.sdata2 : AT(ADDR(.sdata2) - LOAD_OFFSET) {
*(.sdata2)
}
#endif
.data.rel.ro : AT(ADDR(.data.rel.ro) - LOAD_OFFSET) {
*(.data.rel.ro*)
}
.branch_lt : AT(ADDR(.branch_lt) - LOAD_OFFSET) {
*(.branch_lt)
}
@ -349,19 +359,13 @@ SECTIONS
. = ALIGN(PAGE_SIZE);
_sdata = .;
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
*(.data.rel*)
#ifdef CONFIG_PPC32
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
*(.data.rel*)
*(SDATA_MAIN)
*(.sdata2)
}
#else
.data : AT(ADDR(.data) - LOAD_OFFSET) {
DATA_DATA
*(.data.rel*)
}
#endif
}
/* The initial task and kernel stack */
INIT_TASK_DATA_SECTION(THREAD_ALIGN)