Christophe Leroy 5f24d5a579 mm, hugetlb: allow for "high" userspace addresses ... This is a fix for commit f6795053da ("mm: mmap: Allow for "high" userspace addresses") for hugetlb. This patch adds support for "high" userspace addresses that are optionally supported on the system and have to be requested via a hint mechanism ("high" addr parameter to mmap). Architectures such as powerpc and x86 achieve this by making changes to their architectural versions of hugetlb_get_unmapped_area() function. However, arm64 uses the generic version of that function. So take into account arch_get_mmap_base() and arch_get_mmap_end() in hugetlb_get_unmapped_area(). To allow that, move those two macros out of mm/mmap.c into include/linux/sched/mm.h If these macros are not defined in architectural code then they default to (TASK_SIZE) and (base) so should not introduce any behavioural changes to architectures that do not define them. For the time being, only ARM64 is affected by this change. Catalin (ARM64) said "We should have fixed hugetlb_get_unmapped_area() as well when we added support for 52-bit VA. The reason for commit f6795053da was to prevent normal mmap() from returning addresses above 48-bit by default as some user-space had hard assumptions about this. It's a slight ABI change if you do this for hugetlb_get_unmapped_area() but I doubt anyone would notice. It's more likely that the current behaviour would cause issues, so I'd rather have them consistent. Basically when arm64 gained support for 52-bit addresses we did not want user-space calling mmap() to suddenly get such high addresses, otherwise we could have inadvertently broken some programs (similar behaviour to x86 here). Hence we added commit f6795053da. But we missed hugetlbfs which could still get such high mmap() addresses. So in theory that's a potential regression that should have bee addressed at the same time as commit f6795053da (and before arm64 enabled 52-bit addresses)" Link: https://lkml.kernel.org/r/ab847b6edb197bffdfe189e70fb4ac76bfe79e0d.1650033747.git.christophe.leroy@csgroup.eu Fixes: f6795053da ("mm: mmap: Allow for "high" userspace addresses") Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Steve Capper <steve.capper@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: <stable@vger.kernel.org> [5.0.x] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2022-04-21 20:01:09 -07:00
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affinity.h	sched/headers: Add initial new headers as identity mappings	2022-02-23 10:58:28 +01:00
autogroup.h
clock.h
cond_resched.h	sched/headers: Add initial new headers as identity mappings	2022-02-23 10:58:28 +01:00
coredump.h
cpufreq.h
cputime.h
deadline.h	sched/headers: Make the <linux/sched/deadline.h> header build standalone	2022-02-23 10:58:33 +01:00
debug.h
hotplug.h
idle.h
init.h
isolation.h	sched/isolation: Use single feature type while referring to housekeeping cpumask	2022-02-16 15:57:55 +01:00
jobctl.h
loadavg.h
mm.h	mm, hugetlb: allow for "high" userspace addresses	2022-04-21 20:01:09 -07:00
nohz.h
numa_balancing.h
posix-timers.h	sched/headers: Add initial new headers as identity mappings	2022-02-23 10:58:28 +01:00
prio.h
rseq_api.h	sched/headers: Add initial new headers as identity mappings	2022-02-23 10:58:28 +01:00
rt.h
sd_flags.h
signal.h	signal: Move set_notify_signal and clear_notify_signal into sched/signal.h	2022-03-10 16:51:50 -06:00
smt.h
stat.h
sysctl.h	Merge branch 'akpm' (patches from Andrew)	2022-03-22 16:11:53 -07:00
task_flags.h	sched/headers: Add initial new headers as identity mappings	2022-02-23 10:58:28 +01:00
task_stack.h	fork: Move task stack accounting to do_exit()	2022-02-22 22:25:02 +01:00
task.h	exit: Mark do_group_exit() __noreturn	2022-03-15 10:32:43 +01:00
thread_info_api.h	sched/headers: Add initial new headers as identity mappings	2022-02-23 10:58:28 +01:00
topology.h	sched/fair: Adjust the allowed NUMA imbalance when SD_NUMA spans multiple LLCs	2022-02-11 23:30:08 +01:00
types.h
user.h
wake_q.h
xacct.h