linux-kernel - Re: 2.6.20-rc7: known regressions

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Date:	Sat, 03 Feb 2007 11:47:48 +0100
From:	Frédéric Riss <frederic.riss@...il.com>
To:	Andi Kleen <ak@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Matt Domsch <Matt_Domsch@...l.com>,
	Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Eric Van Hensbergen <ericvh@...il.com>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Neil Brown <neilb@...e.de>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Jeff Garzik <jeff@...zik.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Francois Romieu <romieu@...zoreil.com>
Subject: Re: 2.6.20-rc7: known regressions

Le samedi 03 février 2007 à 10:58 +0100, Andi Kleen a écrit :
> Define a efilinkage macro then that expands to nothing on ia64
> 
> Probably asmlinkage would work already, syscall_linkage as used on ia64 doesn't
> seem to affect function pointers.

And here it goes:

When calling into the EFI firmware, the parameters need to be passed on
the stack. The recent change to use -mregparm=3 breaks x86 EFI support.
This patch is needed to allow the new Intel-based Macs to suspend to ram
(efi.get_time is called during the suspend phase).

Signed-off-by: Frederic Riss <frederic.riss@...il.com>
---

diff --git a/include/linux/efi.h b/include/linux/efi.h
index f8ebd7c..596e806 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -157,22 +157,39 @@ typedef struct {
 	unsigned long reset_system;
 } efi_runtime_services_t;
 
-typedef efi_status_t efi_get_time_t (efi_time_t *tm, efi_time_cap_t *tc);
-typedef efi_status_t efi_set_time_t (efi_time_t *tm);
-typedef efi_status_t efi_get_wakeup_time_t (efi_bool_t *enabled, efi_bool_t *pending,
-					    efi_time_t *tm);
-typedef efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled, efi_time_t *tm);
-typedef efi_status_t efi_get_variable_t (efi_char16_t *name, efi_guid_t *vendor, u32 *attr,
-					 unsigned long *data_size, void *data);
-typedef efi_status_t efi_get_next_variable_t (unsigned long *name_size, efi_char16_t *name,
-					      efi_guid_t *vendor);
-typedef efi_status_t efi_set_variable_t (efi_char16_t *name, efi_guid_t *vendor, 
-					 unsigned long attr, unsigned long data_size, 
-					 void *data);
-typedef efi_status_t efi_get_next_high_mono_count_t (u32 *count);
-typedef void efi_reset_system_t (int reset_type, efi_status_t status,
-				 unsigned long data_size, efi_char16_t *data);
-typedef efi_status_t efi_set_virtual_address_map_t (unsigned long memory_map_size,
+#ifdef CONFIG_X86_32
+#define efilinkage asmlinkage
+#else
+#define efilinkage
+#endif
+
+typedef efilinkage efi_status_t efi_get_time_t (efi_time_t *tm,
+						efi_time_cap_t *tc);
+typedef efilinkage efi_status_t efi_set_time_t (efi_time_t *tm);
+typedef efilinkage efi_status_t efi_get_wakeup_time_t (efi_bool_t *enabled, 
+						       efi_bool_t *pending,
+						       efi_time_t *tm);
+typedef efilinkage efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled,
+						       efi_time_t *tm);
+typedef efilinkage efi_status_t efi_get_variable_t (efi_char16_t *name,
+						    efi_guid_t *vendor,
+						    u32 *attr,
+						    unsigned long *data_size,
+						    void *data);
+typedef efilinkage efi_status_t efi_get_next_variable_t (unsigned long *name_sz,
+							 efi_char16_t *name,
+							 efi_guid_t *vendor);
+typedef efilinkage efi_status_t efi_set_variable_t (efi_char16_t *name,
+						    efi_guid_t *vendor,
+						    unsigned long attr,
+						    unsigned long data_size,
+						    void *data);
+typedef efilinkage efi_status_t efi_get_next_high_mono_count_t (u32 *count);
+typedef efilinkage void efi_reset_system_t (int reset_type, 
+					    efi_status_t status,
+					    unsigned long data_size,
+					    efi_char16_t *data);
+typedef efilinkage efi_status_t efi_set_virtual_address_map_t (unsigned long memory_map_size,
 						unsigned long descriptor_size,
 						u32 descriptor_version,
 						efi_memory_desc_t *virtual_map);



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