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efi/libstub: Bump up EFI_MMAP_NR_SLACK_SLOTS to 32

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commit ec4696925da6b9baec38345184403ce9e29a2e48 upstream.

Recent platforms require more slack slots than the current value of
EFI_MMAP_NR_SLACK_SLOTS, otherwise they fail to boot. The current
workaround is to append `efi=disable_early_pci_dma` to the kernel's
cmdline. So, bump up EFI_MMAP_NR_SLACK_SLOTS to 32 to allow those
platforms to boot with the aforementioned workaround.

Signed-off-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Allen Pais <apais@linux.microsoft.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hamza Mahfooz
2024-12-09 13:20:39 -05:00
committed by Greg Kroah-Hartman
parent 4f687721a9
commit dafbcfb8ff
1 changed files with 1 additions and 1 deletions
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2
drivers/firmware/efi/libstub/efistub.h
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@@ -171,7 +171,7 @@ void efi_set_u64_split(u64 data, u32 *lo, u32 *hi)
* the EFI memory map. Other related structures, e.g. x86 e820ext, need
* to factor in this headroom requirement as well.
*/
#define EFI_MMAP_NR_SLACK_SLOTS 8
#define EFI_MMAP_NR_SLACK_SLOTS 32
typedef struct efi_generic_dev_path efi_device_path_protocol_t;