Hi Chris,
[auto build test WARNING on rockchip/for-next -- if it's inappropriate base, please ignore]
config: i386-randconfig-h1-10111440 (attached as .config)
reproduce:
# save the attached .config to linux build tree
make ARCH=i386
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
drivers/gpu/drm/bridge/dw_mipi_dsi.c: In function 'dw_mipi_dsi_bridge_mode_set':
drivers/gpu/drm/bridge/dw_mipi_dsi.c:451:17: warning: 'n' may be used uninitialized in this function [-Wmaybe-uninitialized]
dsi->input_div = n;
^
drivers/gpu/drm/bridge/dw_mipi_dsi.c:412:9: note: 'n' was declared here
int m, n, pre;
^
drivers/gpu/drm/bridge/dw_mipi_dsi.c:452:20: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
dsi->feedback_div = m;
^
drivers/gpu/drm/bridge/dw_mipi_dsi.c:412:6: note: 'm' was declared here
int m, n, pre;
^
In file included from arch/x86/include/asm/realmode.h:5:0,
from arch/x86/include/asm/acpi.h:33,
from arch/x86/include/asm/fixmap.h:19,
from arch/x86/include/asm/apic.h:12,
from arch/x86/include/asm/smp.h:12,
from include/linux/smp.h:59,
from include/linux/topology.h:33,
from include/linux/gfp.h:8,
from include/linux/kmod.h:22,
from include/linux/module.h:13,
from drivers/gpu/drm/bridge/dw_mipi_dsi.c:12:
>> arch/x86/include/asm/io.h:53:3: warning: 'calor' may be used uninitialized in this function [-Wmaybe-uninitialized]
{ asm volatile("mov" size " %0,%1": :reg (val), \
^
drivers/gpu/drm/bridge/dw_mipi_dsi.c:763:15: note: 'calor' was declared here
u32 val = 0, calor;
^
drivers/gpu/drm/bridge/dw_mipi_dsi.c:410:15: warning: 'max_mbps' may be used uninitialized in this function [-Wmaybe-uninitialized]
unsigned int max_mbps, target_mbps = 1000;
^
vim +/calor +53 arch/x86/include/asm/io.h
b310f381d include/asm-x86/io.h venkatesh.pallipadi@xxxxxxxxx 2008-03-18 37 #define ARCH_HAS_IOREMAP_WC
d838270e2 arch/x86/include/asm/io.h Toshi Kani 2015-06-04 38 #define ARCH_HAS_IOREMAP_WT
b310f381d include/asm-x86/io.h venkatesh.pallipadi@xxxxxxxxx 2008-03-18 39
1c5b9069e arch/x86/include/asm/io.h Brian Gerst 2010-02-05 40 #include <linux/string.h>
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 41 #include <linux/compiler.h>
976e8f677 arch/x86/include/asm/io.h Jeremy Fitzhardinge 2009-02-06 42 #include <asm/page.h>
5b7c73e00 arch/x86/include/asm/io.h Mark Salter 2014-04-07 43 #include <asm/early_ioremap.h>
d6472302f arch/x86/include/asm/io.h Stephen Rothwell 2015-06-02 44 #include <asm/pgtable_types.h>
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 45
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 46 #define build_mmio_read(name, size, type, reg, barrier) \
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 47 static inline type name(const volatile void __iomem *addr) \
1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 48 { type ret; asm volatile("mov" size " %1,%0":reg (ret) \
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 49 :"m" (*(volatile type __force *)addr) barrier); return ret; }
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 50
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 51 #define build_mmio_write(name, size, type, reg, barrier) \
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 52 static inline void name(type val, volatile void __iomem *addr) \
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 @53 { asm volatile("mov" size " %0,%1": :reg (val), \
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 54 "m" (*(volatile type __force *)addr) barrier); }
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 55
1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 56 build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 57 build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 58 build_mmio_read(readl, "l", unsigned int, "=r", :"memory")
c1f64a580 include/asm-x86/io.h Linus Torvalds 2008-05-27 59
1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 60 build_mmio_read(__readb, "b", unsigned char, "=q", )
1c5b0eb66 include/asm-x86/io.h Mikael Pettersson 2008-08-13 61 build_mmio_read(__readw, "w", unsigned short, "=r", )
:::::: The code at line 53 was first introduced by commit
:::::: c1f64a58003fd2efaa725a857e269a15f765791a x86: MMIO and gcc re-ordering issue
:::::: TO: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
:::::: CC: Ingo Molnar <mingo@xxxxxxx>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
Attachment:
.config.gz
Description: Binary data
_______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
