diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2015-12-09 12:44:37 +0000 |
|---|---|---|
| committer | Jeff Vander Stoep <jeffv@google.com> | 2016-09-18 13:19:38 -0700 |
| commit | 31400ef82e7ae74663e9ca8e041516ede5e617e4 (patch) | |
| tree | 0767ef1ff3ae03a03c9493c46748b5b337265d84 /arch/arm64/kernel | |
| parent | c47e4a12f511721dab3d2407d18e0e1a6b7b0e1c (diff) | |
BACKPORT: arm64: Remove redundant padding from linker script
Currently we place an ALIGN_DEBUG_RO between text and data for the .text
and .init sections, and depending on configuration each of these may
result in up to SECTION_SIZE bytes worth of padding (for
DEBUG_RODATA_ALIGN).
We make no distinction between the text and data in each of these
sections at any point when creating the initial page tables in head.S.
We also make no distinction when modifying the tables; __map_memblock,
fixup_executable, mark_rodata_ro, and fixup_init only work at section
granularity. Thus this padding is unnecessary.
For the spit between init text and data we impose a minimum alignment of
16 bytes, but this is also unnecessary. The init data is output
immediately after the padding before any symbols are defined, so this is
not required to keep a symbol for linker a section array correctly
associated with the data. Any objects within the section will be given
at least their usual alignment regardless.
This patch removes the redundant padding.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc: Laura Abbott <labbott@fedoraproject.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Bug: 30369029
Patchset: rework-pagetable
(cherry picked from commit 5b28cd9d084eca8ddc46270d2720305bfd40e348)
Signed-off-by: Jeff Vander Stoep <jeffv@google.com>
Change-Id: I5540ba1f4d90e2ae8fafa22e98c389bc4e975ac7
Diffstat (limited to 'arch/arm64/kernel')
| -rw-r--r-- | arch/arm64/kernel/vmlinux.lds.S | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index f472809a7b45..1cc195872a1f 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -113,7 +113,6 @@ SECTIONS *(.got) /* Global offset table */ } - ALIGN_DEBUG_RO _etext = .; /* End of text section */ RO_DATA(PAGE_SIZE) @@ -129,7 +128,6 @@ SECTIONS ARM_EXIT_KEEP(EXIT_TEXT) } - ALIGN_DEBUG_RO_MIN(16) .init.data : { INIT_DATA INIT_SETUP(16) |