[PATCH 32/33] efi: Clean up config table description arrays

Ard Biesheuvel
2020-04-24T13:07:29Z

Increase legibility by adding whitespace to the efi_config_table_type_t
arrays that describe which EFI config tables we look for when going over
the firmware provided list. While at it, replace the 'name' char pointer
with a char array, which is more space efficient on relocatable 64-bit
kernels, as it avoids a 8 byte pointer and the associated relocation
data (24 bytes when using RELA format)

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
arch/ia64/kernel/efi.c | 12 ++++++------
arch/x86/platform/efi/efi.c | 8 ++++----
drivers/firmware/efi/arm-init.c | 4 ++--
drivers/firmware/efi/efi.c | 28 ++++++++++++++--------------
include/linux/efi.h | 2 +-
5 files changed, 27 insertions(+), 27 deletions(-)

diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index f69f3fe0532e..a54eacbc61a9 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -57,12 +57,12 @@ unsigned long hcdp_phys = EFI_INVALID_TABLE_ADDR;
unsigned long sal_systab_phys = EFI_INVALID_TABLE_ADDR;

static const efi_config_table_type_t arch_tables[] __initconst = {
- {ESI_TABLE_GUID, "ESI", &esi_phys},
- {HCDP_TABLE_GUID, "HCDP", &hcdp_phys},
- {MPS_TABLE_GUID, "MPS", &mps_phys},
- {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, "PALO", &palo_phys},
- {SAL_SYSTEM_TABLE_GUID, "SALsystab", &sal_systab_phys},
- {NULL_GUID, NULL, 0},
+ {ESI_TABLE_GUID, &esi_phys, "ESI" },
+ {HCDP_TABLE_GUID, &hcdp_phys, "HCDP" },
+ {MPS_TABLE_GUID, &mps_phys, "MPS" },
+ {PROCESSOR_ABSTRACTION_LAYER_OVERWRITE_GUID, &palo_phys, "PALO" },
+ {SAL_SYSTEM_TABLE_GUID, &sal_systab_phys, "SALsystab" },
+ {},
};

extern efi_status_t efi_call_phys (void *, ...);
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 1aae5302501d..e966115d105c 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -62,12 +62,12 @@ static unsigned long efi_runtime, efi_nr_tables;
unsigned long efi_fw_vendor, efi_config_table;

static const efi_config_table_type_t arch_tables[] __initconst = {
- {EFI_PROPERTIES_TABLE_GUID, "PROP", &prop_phys},
- {UGA_IO_PROTOCOL_GUID, "UGA", &uga_phys},
+ {EFI_PROPERTIES_TABLE_GUID, &prop_phys, "PROP" },
+ {UGA_IO_PROTOCOL_GUID, &uga_phys, "UGA" },
#ifdef CONFIG_X86_UV
- {UV_SYSTEM_TABLE_GUID, "UVsystab", &uv_systab_phys},
+ {UV_SYSTEM_TABLE_GUID, &uv_systab_phys, "UVsystab" },
#endif
- {NULL_GUID, NULL, NULL},
+ {},
};

static const unsigned long * const efi_tables[] = {
diff --git a/drivers/firmware/efi/arm-init.c b/drivers/firmware/efi/arm-init.c
index 9e5e62f5f94d..c697e70ca7e7 100644
--- a/drivers/firmware/efi/arm-init.c
+++ b/drivers/firmware/efi/arm-init.c
@@ -54,8 +54,8 @@ static phys_addr_t __init efi_to_phys(unsigned long addr)
static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;

static const efi_config_table_type_t arch_tables[] __initconst = {
- {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, NULL, &screen_info_table},
- {NULL_GUID, NULL, NULL}
+ {LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
+ {}
};

static void __init init_screen_info(void)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 911a2bd0f6b7..e49c0b6db988 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -502,21 +502,21 @@ void __init efi_mem_reserve(phys_addr_t addr, u64 size)
}

static const efi_config_table_type_t common_tables[] __initconst = {
- {ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
- {ACPI_TABLE_GUID, "ACPI", &efi.acpi},
- {SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
- {SMBIOS3_TABLE_GUID, "SMBIOS 3.0", &efi.smbios3},
- {EFI_SYSTEM_RESOURCE_TABLE_GUID, "ESRT", &efi.esrt},
- {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, "MEMATTR", &efi_mem_attr_table},
- {LINUX_EFI_RANDOM_SEED_TABLE_GUID, "RNG", &efi_rng_seed},
- {LINUX_EFI_TPM_EVENT_LOG_GUID, "TPMEventLog", &efi.tpm_log},
- {LINUX_EFI_TPM_FINAL_LOG_GUID, "TPMFinalLog", &efi.tpm_final_log},
- {LINUX_EFI_MEMRESERVE_TABLE_GUID, "MEMRESERVE", &mem_reserve},
- {EFI_RT_PROPERTIES_TABLE_GUID, "RTPROP", &rt_prop},
+ {ACPI_20_TABLE_GUID, &efi.acpi20, "ACPI 2.0" },
+ {ACPI_TABLE_GUID, &efi.acpi, "ACPI" },
+ {SMBIOS_TABLE_GUID, &efi.smbios, "SMBIOS" },
+ {SMBIOS3_TABLE_GUID, &efi.smbios3, "SMBIOS 3.0" },
+ {EFI_SYSTEM_RESOURCE_TABLE_GUID, &efi.esrt, "ESRT" },
+ {EFI_MEMORY_ATTRIBUTES_TABLE_GUID, &efi_mem_attr_table, "MEMATTR" },
+ {LINUX_EFI_RANDOM_SEED_TABLE_GUID, &efi_rng_seed, "RNG" },
+ {LINUX_EFI_TPM_EVENT_LOG_GUID, &efi.tpm_log, "TPMEventLog" },
+ {LINUX_EFI_TPM_FINAL_LOG_GUID, &efi.tpm_final_log, "TPMFinalLog" },
+ {LINUX_EFI_MEMRESERVE_TABLE_GUID, &mem_reserve, "MEMRESERVE" },
+ {EFI_RT_PROPERTIES_TABLE_GUID, &rt_prop, "RTPROP" },
#ifdef CONFIG_EFI_RCI2_TABLE
- {DELLEMC_EFI_RCI2_TABLE_GUID, NULL, &rci2_table_phys},
+ {DELLEMC_EFI_RCI2_TABLE_GUID, &rci2_table_phys },
#endif
- {NULL_GUID, NULL, NULL},
+ {},
};

static __init int match_config_table(const efi_guid_t *guid,
@@ -529,7 +529,7 @@ static __init int match_config_table(const efi_guid_t *guid,
for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
if (!efi_guidcmp(*guid, table_types[i].guid)) {
*(table_types[i].ptr) = table;
- if (table_types[i].name)
+ if (table_types[i].name[0])
pr_cont(" %s=0x%lx ",
table_types[i].name, table);
return 1;
diff --git a/include/linux/efi.h b/include/linux/efi.h
index 251f1f783cdf..9b7c7ec319ac 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -379,8 +379,8 @@ typedef union {

typedef struct {
efi_guid_t guid;
- const char *name;
unsigned long *ptr;
+ const char name[16];
} efi_config_table_type_t;

#define EFI_SYSTEM_TABLE_SIGNATURE ((u64)0x5453595320494249ULL)
--
2.17.1