Nicolai Stange 012a4163be um: asm/page.h: remove the pte_high member from struct pte_t ... Commit 16da306849 ("um: kill pfn_t") introduced a compile warning for defconfig (SUBARCH=i386): arch/um/kernel/skas/mmu.c:38:206: warning: right shift count >= width of type [-Wshift-count-overflow] Aforementioned patch changes the definition of the phys_to_pfn() macro from ((pfn_t) ((p) >> PAGE_SHIFT)) to ((p) >> PAGE_SHIFT) This effectively changes the phys_to_pfn() expansion's type from unsigned long long to unsigned long. Through the callchain init_stub_pte() => mk_pte(), the expansion of phys_to_pfn() is (indirectly) fed into the 'phys' argument of the pte_set_val(pte, phys, prot) macro, eventually leading to (pte).pte_high = (phys) >> 32; This results in the warning from above. Since UML only deals with 32 bit addresses, the upper 32 bits from 'phys' used to be always zero anyway. Also, all page protection flags defined by UML don't use any bits beyond bit 9. Since the contents of a PTE are defined within architecture scope only, the ->pte_high member can be safely removed. Remove the ->pte_high member from struct pte_t. Rename ->pte_low to ->pte. Adapt the pte helper macros in arch/um/include/asm/page.h. Noteworthy is the pte_copy() macro where a smp_wmb() gets dropped. This write barrier doesn't seem to be paired with any read barrier though and thus, was useless anyway. Fixes: 16da306849 ("um: kill pfn_t") Signed-off-by: Nicolai Stange <nicstange@gmail.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Richard Weinberger <richard@nod.at> Cc: Nicolai Stange <nicstange@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-02-05 18:10:40 -08:00
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alpha
arc
arm	ARM: wire up copy_file_range() syscall	2016-01-27 18:14:46 +00:00
arm64	arm64 fixes:	2016-02-04 14:09:55 -08:00
avr32
blackfin
c6x
cris
frv
h8300
hexagon
ia64
m32r	m32r: fix build failure due to SMP and MMU	2016-02-05 18:10:40 -08:00
m68k
metag
microblaze
mips	Revert "MIPS: bcm63xx: nvram: Remove unused bcm63xx_nvram_get_psi_size() function"	2016-01-27 20:51:50 +01:00
mn10300
nios2
openrisc
parisc
powerpc	powerpc fixes for 4.5	2016-01-29 16:10:16 -08:00
s390	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux	2016-01-29 16:05:18 -08:00
score
sh	sh: fix smp_store_mb for !SMP	2016-01-26 10:18:29 +02:00
sparc
tile
um	um: asm/page.h: remove the pte_high member from struct pte_t	2016-02-05 18:10:40 -08:00
unicore32
x86	mm, hugetlb: don't require CMA for runtime gigantic pages	2016-02-05 18:10:40 -08:00
xtensa
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Kconfig