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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-10-13 00:15:25 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-10-13 00:19:03 +0100 |
| commit | 06c10884486a63a1e4ff657aaa51e848e64b9dc3 (patch) | |
| tree | 3913f3d19b60a9e6a62484e2f4e352d9dcf995a8 | |
| parent | 841f48a849e0dc14fe6f3d2bd31e831ac6a76546 (diff) | |
| download | lwn-06c10884486a63a1e4ff657aaa51e848e64b9dc3.tar.gz lwn-06c10884486a63a1e4ff657aaa51e848e64b9dc3.zip | |
ARM: relax ioremap prohibition (309caa9) for -final and -stable
... but produce a big warning about the problem as encouragement
for people to fix their drivers.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/mm/ioremap.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/arm/mm/ioremap.c b/arch/arm/mm/ioremap.c index ab506272b2d3..17e7b0b57e49 100644 --- a/arch/arm/mm/ioremap.c +++ b/arch/arm/mm/ioremap.c @@ -204,8 +204,12 @@ void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn, /* * Don't allow RAM to be mapped - this causes problems with ARMv6+ */ - if (WARN_ON(pfn_valid(pfn))) - return NULL; + if (pfn_valid(pfn)) { + printk(KERN_WARNING "BUG: Your driver calls ioremap() on system memory. This leads\n" + KERN_WARNING "to architecturally unpredictable behaviour on ARMv6+, and ioremap()\n" + KERN_WARNING "will fail in the next kernel release. Please fix your driver.\n"); + WARN_ON(1); + } type = get_mem_type(mtype); if (!type) |