A test-build of e820.o with -Wswitch-enum shows the following warnings:
arch/x86/kernel/e820.c: In function ‘e820_type_to_string’:
arch/x86/kernel/e820.c:965:2: warning: enumeration value ‘E820_TYPE_RESERVED’
not handled in switch [-Wswitch-enum]
switch (entry->type) {
^
arch/x86/kernel/e820.c: In function ‘e820_type_to_iomem_type’:
arch/x86/kernel/e820.c:979:2: warning: enumeration value ‘E820_TYPE_RESERVED’
not handled in switch [-Wswitch-enum]
switch (entry->type) {
^
arch/x86/kernel/e820.c: In function ‘e820_type_to_iores_desc’:
arch/x86/kernel/e820.c:993:2: warning: enumeration value ‘E820_TYPE_RESERVED’
not handled in switch [-Wswitch-enum]
switch (entry->type) {
^
arch/x86/kernel/e820.c: In function ‘do_mark_busy’:
arch/x86/kernel/e820.c:1015:2: warning: enumeration value ‘E820_TYPE_RAM’ not
handled in switch [-Wswitch-enum]
switch (type) {
^
Here's the four warnings:
- The one in e820_type_to_string() is a borderline bug, we should
differentiate
known-reserved E820 types from unknown types. Fix it by printing a separate
message for unknown E820 types.
- The ones in e820_type_to_iomem_type(), e820_type_to_iores_desc() and
do_mark_busy() are worth documenting, at least to the extent of
enumerating them explicitly.
Cc: Alex Thorlton <athorl...@sgi.com>
Cc: Andy Lutomirski <l...@kernel.org>
Cc: Borislav Petkov <b...@alien8.de>
Cc: Brian Gerst <brge...@gmail.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Denys Vlasenko <dvlas...@redhat.com>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Huang, Ying <ying.hu...@intel.com>
Cc: Josh Poimboeuf <jpoim...@redhat.com>
Cc: Juergen Gross <jgr...@suse.com>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Paul Jackson <p...@sgi.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Rafael J. Wysocki <r...@sisk.pl>
Cc: Tejun Heo <t...@kernel.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Wei Yang <richard.weiy...@gmail.com>
Cc: Yinghai Lu <ying...@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
arch/x86/kernel/e820.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index d2c6468a8d38..20834a81854e 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -970,7 +970,8 @@ static const char *__init e820_type_to_string(struct
e820_entry *entry)
case E820_TYPE_UNUSABLE: return "Unusable memory";
case E820_TYPE_PRAM: return "Persistent Memory (legacy)";
case E820_TYPE_PMEM: return "Persistent Memory";
- default: return "Reserved";
+ case E820_TYPE_RESERVED: return "Reserved";
+ default: return "Unknown E820 type";
}
}
@@ -984,6 +985,7 @@ static unsigned long __init e820_type_to_iomem_type(struct
e820_entry *entry)
case E820_TYPE_UNUSABLE: /* Fall-through: */
case E820_TYPE_PRAM: /* Fall-through: */
case E820_TYPE_PMEM: /* Fall-through: */
+ case E820_TYPE_RESERVED: /* Fall-through: */
default: return IORESOURCE_MEM;
}
}
@@ -998,11 +1000,12 @@ static unsigned long __init
e820_type_to_iores_desc(struct e820_entry *entry)
case E820_TYPE_RESERVED_KERN: /* Fall-through: */
case E820_TYPE_RAM: /* Fall-through: */
case E820_TYPE_UNUSABLE: /* Fall-through: */
+ case E820_TYPE_RESERVED: /* Fall-through: */
default: return IORES_DESC_NONE;
}
}
-static bool __init do_mark_busy(u32 type, struct resource *res)
+static bool __init do_mark_busy(enum e820_type type, struct resource *res)
{
/* this is the legacy bios/dos rom-shadow + mmio region */
if (res->start < (1ULL<<20))
@@ -1017,6 +1020,11 @@ static bool __init do_mark_busy(u32 type, struct
resource *res)
case E820_TYPE_PRAM:
case E820_TYPE_PMEM:
return false;
+ case E820_TYPE_RESERVED_KERN:
+ case E820_TYPE_RAM:
+ case E820_TYPE_ACPI:
+ case E820_TYPE_NVS:
+ case E820_TYPE_UNUSABLE:
default:
return true;
}
--
2.7.4
