kernel/linux.git/arch/mips/include/asm/page.h, branch linux-4.16.y

MIPS: page.h: Define virt_to_pfn()

2017-11-09T13:25:44+00:00

Define virt_to_pfn() based on the existing definition of virt_to_page() which already does a PFN_DOWN(vir_to_phys(kaddr)). Signed-off-by: Florian Fainelli Cc: Ralf Baechle Cc: Paul Burton Cc: Maciej W. Rozycki Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/15409/ Signed-off-by: James Hogan

treewide: replace config_enabled() with IS_ENABLED() (2nd round)

2016-08-27T00:39:35+00:00

Commit 97f2645f358b ("tree-wide: replace config_enabled() with IS_ENABLED()") mostly killed config_enabled(), but some new users have appeared for v4.8-rc1. They are all used for a boolean option, so can be replaced with IS_ENABLED() safely. Link: http://lkml.kernel.org/r/1471970749-24867-1-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada Acked-by: Kees Cook Acked-by: Peter Oberparleiter Cc: Martin Schwidefsky Cc: Heiko Carstens Cc: Ralf Baechle Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Thomas Gleixner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

MIPS: Use CPHYSADDR to implement mips32 __pa

2016-08-02T12:01:02+00:00

Use CPHYSADDR to implement the __pa macro converting from a virtual to a physical address for MIPS32, much as is already done for MIPS64 (though without the complication of having both compatibility & XKPHYS segments). This allows for __pa to work regardless of whether the address being translated is in kseg0 or kseg1, unlike the previous subtraction based approach which only worked for addresses in kseg0. Working for kseg1 addresses is important if __pa is used on addresses allocated by dma_alloc_coherent, where on systems with non-coherent I/O we provide addresses in kseg1. If this address is then used with dma_map_single_attrs then it is provided to virt_to_page, which in turn calls virt_to_phys which is a wrapper around __pa. The result is that we end up with a physical address 0x20000000 bytes (ie. the size of kseg0) too high. In addition to providing consistency with MIPS64 & fixing the kseg1 case above this has the added bonus of generating smaller code for systems implementing MIPS32r2 & beyond, where a single ext instruction can extract the physical address rather than needing to load an immediate into a temp register & subtract it. This results in ~1.3KB savings for a boston_defconfig kernel adjusted to set CONFIG_32BIT=y. This patch does not change the EVA case, which may or may not have similar issues around handling both cached & uncached addresses but is beyond the scope of this patch. Signed-off-by: Paul Burton Cc: Dan Williams Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/13836/ Signed-off-by: Ralf Baechle

MIPS: non-exec stack & heap when non-exec PT_GNU_STACK is present

2016-08-02T07:29:27+00:00

The stack and heap have both been executable by default on MIPS until now. This patch changes the default to be non-executable, but only for ELF binaries with a non-executable PT_GNU_STACK header present. This does apply to both the heap & the stack, despite the name PT_GNU_STACK, and this matches the behaviour of other architectures like ARM & x86. Current MIPS toolchains do not produce the PT_GNU_STACK header, which means that we can rely upon this patch not changing the behaviour of existing binaries. The new default will only take effect for newly compiled binaries once toolchains are updated to support PT_GNU_STACK, and since those binaries are newly compiled they can be compiled expecting the change in default behaviour. Again this matches the way in which the ARM & x86 architectures handled their implementations of non-executable memory. Signed-off-by: Paul Burton Cc: Leonid Yegoshin Cc: Maciej Rozycki Cc: Faraz Shahbazker Cc: Raghu Gandham Cc: Matthew Fortune Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13765/ Signed-off-by: Ralf Baechle

Revert "MIPS: Fix PAGE_MASK definition"

2016-01-22T23:28:57+00:00

This reverts commit 22b14523994588279ae9c5ccfe64073c1e5b3c00. It was originally sent in an earlier revision of the pfn_t patchset. Besides being broken, the warning is also fixed by PFN_FLAGS_MASK casting the PAGE_MASK to an unsigned long. Reported-by: Manuel Lauss Signed-off-by: Dan Williams Cc: linux-kernel@vger.kernel.org Cc: Linux-MIPS Cc: stable@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/12182/ Signed-off-by: Ralf Baechle

MIPS: Fix flood of warnings about comparsion being always true.

2015-11-16T11:07:10+00:00

./arch/mips/include/asm/page.h:204:13: warning: comparison of unsigned expression >= 0 is always true [-Wtype-limits] The default value of ARCH_PFN_OFFSET is 0 thus triggering this warning for all platforms using the default value. Signed-off-by: Ralf Baechle

MIPS: Fix PAGE_MASK definition

2015-11-12T10:35:47+00:00

Make PAGE_MASK an unsigned long, like it is on x86, to avoid: In file included from arch/mips/kernel/asm-offsets.c:14:0: include/linux/mm.h: In function '__pfn_to_pfn_t': include/linux/mm.h:1050:2: warning: left shift count >= width of type pfn_t pfn_t = { .val = pfn | (flags & PFN_FLAGS_MASK), }; ...where PFN_FLAGS_MASK is: #define PFN_FLAGS_MASK (~PAGE_MASK << (BITS_PER_LONG - PAGE_SHIFT)) Signed-off-by: Dan Williams Cc: ross.zwisler@linux.intel.com Cc: hch@lst.de Cc: linux-mips@linux-mips.org Cc: linux-nvdimm@lists.01.org Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org Patchwork: https://patchwork.linux-mips.org/patch/11280/ Signed-off-by: Ralf Baechle

MIPS: Remove prototype for copy_user_page

2015-04-02T11:54:18+00:00

MIPS architecture code does not provide copy_user_page, so it should not provide a prototype for it either. Signed-off-by: Guenter Roeck Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/9266/ Signed-off-by: Ralf Baechle

MIPS: Replace MIPS-specific 64BIT_PHYS_ADDR with generic PHYS_ADDR_T_64BIT

2014-11-24T21:46:44+00:00

Signed-off-by: Ralf Baechle

MIPS: Fix a warning for virt_to_page

2014-08-26T00:27:47+00:00

Compiling mm/highmem.c gives a warning: passing argument 1 of 'virt_to_phys' makes pointer from integer without a cast Fixed by casting to void* Signed-off-by: Zubair Lutfullah Kakakhel Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7337/ Signed-off-by: Ralf Baechle