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| author | Nicholas Piggin <npiggin@gmail.com> | 2022-09-16 06:07:49 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-09-26 12:58:16 +0200 |
| commit | 7082f8e7d2276575a8806370007cbb4a7b9abdce (patch) | |
| tree | 8b534ee44f283a58de7353121e364a7f9e524747 /arch/powerpc/mm/pgtable_32.c | |
| parent | powerpc/vmlinux.lds: Add an explicit symbol for the SRWX boundary (diff) | |
| download | linux-7082f8e7d2276575a8806370007cbb4a7b9abdce.tar.xz linux-7082f8e7d2276575a8806370007cbb4a7b9abdce.zip | |
powerpc: move __end_rodata to cover arch read-only sections
powerpc has a number of read-only sections and tables that are put after
RO_DATA(). Move the __end_rodata symbol to cover these as well.
Setting memory to read-only at boot is done using __init_begin, change
that to use __end_rodata.
This makes is_kernel_rodata() exactly cover the read-only region, as
well as other things using __end_rodata (e.g., kernel/dma/debug.c).
Boot dmesg also prints the rodata size more accurately.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220916040755.2398112-2-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc/mm/pgtable_32.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable_32.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index 3ac73f9fb5d5..5c02fd08d61e 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -158,10 +158,11 @@ void mark_rodata_ro(void) } /* - * mark .text and .rodata as read only. Use __init_begin rather than - * __end_rodata to cover NOTES and EXCEPTION_TABLE. + * mark text and rodata as read only. __end_rodata is set by + * powerpc's linker script and includes tables and data + * requiring relocation which are not put in RO_DATA. */ - numpages = PFN_UP((unsigned long)__init_begin) - + numpages = PFN_UP((unsigned long)__end_rodata) - PFN_DOWN((unsigned long)_stext); set_memory_ro((unsigned long)_stext, numpages); |