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authorDave Martin <Dave.Martin@arm.com>2017-10-31 15:50:53 +0000
committerWill Deacon <will.deacon@arm.com>2017-11-03 15:24:11 +0000
commit27e64b4be4b863d884f3ec1686a2f744ae93a1b9 (patch)
treeae548b3f473891f3aec3b0cbc53d44173fb101e7 /arch/arm64
parentc7f5828bf77dcbd61d51f4736c1d5aa35663fbb4 (diff)
regset: Add support for dynamically sized regsets
Currently the regset API doesn't allow for the possibility that regsets (or at least, the amount of meaningful data in a regset) may change in size. In particular, this results in useless padding being added to coredumps if a regset's current size is smaller than its theoretical maximum size. This patch adds a get_size() function to struct user_regset. Individual regset implementations can implement this function to return the current size of the regset data. A regset_size() function is added to provide callers with an abstract interface for determining the size of a regset without needing to know whether the regset is dynamically sized or not. The only affected user of this interface is the ELF coredump code: This patch ports ELF coredump to dump regsets with their actual size in the coredump. This has no effect except for new regsets that are dynamically sized and provide a get_size() implementation. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Dmitry Safonov <dsafonov@virtuozzo.com> Cc: H. J. Lu <hjl.tools@gmail.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64')
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