efi: Simplify arch_efi_call_virt() macro

Currently, the arch_efi_call_virt() assumes all users of it will have
defined a type 'efi_##f##_t' to make use of it.

Simplify the arch_efi_call_virt() macro by eliminating the explicit
need for efi_##f##_t type for every user of this macro.
Signed-off-by: NSudeep Holla <sudeep.holla@arm.com>
Acked-by: NRussell King (Oracle) <rmk+kernel@armlinux.org.uk>
[ardb: apply Sudeep's ARM fix to i686, Loongarch and RISC-V too]
Signed-off-by: NArd Biesheuvel <ardb@kernel.org>

arch/arm/include/asm/efi.h

@@ -24,13 +24,6 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 #define arch_efi_call_virt_setup()	efi_virtmap_load()
 #define arch_efi_call_virt_teardown()	efi_virtmap_unload()
 
-#define arch_efi_call_virt(p, f, args...)				\
-({									\
-	efi_##f##_t *__f;						\
-	__f = p->f;							\
-	__f(args);							\
-})
-
 #define ARCH_EFI_IRQ_FLAGS_MASK \
 	(PSR_J_BIT | PSR_E_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | \
 	 PSR_T_BIT | MODE_MASK)

arch/arm64/include/asm/efi.h

@@ -27,12 +27,9 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 	__efi_fpsimd_begin();						\
 })
 
+#undef arch_efi_call_virt
 #define arch_efi_call_virt(p, f, args...)				\
-({									\
-	efi_##f##_t *__f;						\
-	__f = p->f;							\
-	__efi_rt_asm_wrapper(__f, #f, args);				\
-})
+	__efi_rt_asm_wrapper((p)->f, #f, args)
 
 #define arch_efi_call_virt_teardown()					\
 ({									\

arch/loongarch/include/asm/efi.h

@@ -13,20 +13,8 @@ void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
 
 #define ARCH_EFI_IRQ_FLAGS_MASK  0x00000004  /* Bit 2: CSR.CRMD.IE */
 
-#define arch_efi_call_virt_setup()               \
-({                                               \
-})
-
-#define arch_efi_call_virt(p, f, args...)        \
-({                                               \
-	efi_##f##_t * __f;                       \
-	__f = p->f;                              \
-	__f(args);                               \
-})
-
-#define arch_efi_call_virt_teardown()            \
-({                                               \
-})
+#define arch_efi_call_virt_setup()
+#define arch_efi_call_virt_teardown()
 
 #define EFI_ALLOC_ALIGN		SZ_64K
 

arch/riscv/include/asm/efi.h

@@ -23,8 +23,6 @@ int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md);
 #define arch_efi_call_virt_setup()      efi_virtmap_load()
 #define arch_efi_call_virt_teardown()   efi_virtmap_unload()
 
-#define arch_efi_call_virt(p, f, args...) p->f(args)
-
 #define ARCH_EFI_IRQ_FLAGS_MASK (SR_IE | SR_SPIE)
 
 /* Load initrd anywhere in system RAM */

arch/x86/include/asm/efi.h

@@ -100,8 +100,6 @@ static inline void efi_fpu_end(void)
 	efi_fpu_end();							\
 })
 
-#define arch_efi_call_virt(p, f, args...)	p->f(args)
-
 #else /* !CONFIG_X86_32 */
 
 #define EFI_LOADER_SIGNATURE	"EL64"
@@ -121,6 +119,7 @@ extern asmlinkage u64 __efi_call(void *fp, ...);
 	efi_enter_mm();							\
 })
 
+#undef arch_efi_call_virt
 #define arch_efi_call_virt(p, f, args...) ({				\
 	u64 ret, ibt = ibt_save();					\
 	ret = efi_call((void *)p->f, args);				\

include/linux/efi.h

@@ -1200,6 +1200,8 @@ static inline void efi_check_for_embedded_firmwares(void) { }
 
 efi_status_t efi_random_get_seed(void);
 
+#define arch_efi_call_virt(p, f, args...)	((p)->f(args))
+
 /*
  * Arch code can implement the following three template macros, avoiding
  * reptition for the void/non-void return cases of {__,}efi_call_virt():