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
..
configs
drivers	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-01-12 17:11:47 -08:00
include	um: asm/page.h: remove the pte_high member from struct pte_t	2016-02-05 18:10:40 -08:00
kernel	um: Add seccomp support	2016-01-10 21:49:49 +01:00
os-Linux	um: Use race-free temporary file creation	2016-01-10 21:49:50 +01:00
scripts
.gitignore
Kconfig.char
Kconfig.common	um: Add seccomp support	2016-01-10 21:49:49 +01:00
Kconfig.debug
Kconfig.net
Kconfig.rest
Kconfig.um	um: Add seccomp support	2016-01-10 21:49:49 +01:00
Makefile	arch: um: fix error when linking vmlinux.	2015-12-08 22:25:13 +01:00
Makefile-os-Linux
Makefile-skas