git: 8bf162765f42 - stable/13 - stand/efi: Document the copy size trick

The branch stable/13 has been updated by imp:

URL: https://cgit.FreeBSD.org/src/commit/?id=8bf162765f4268b31ac17e9fe398f69713752440

commit 8bf162765f4268b31ac17e9fe398f69713752440
Author:     Warner Losh <imp@FreeBSD.org>
AuthorDate: 2022-12-04 00:23:16 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2023-01-24 21:49:41 +0000

    stand/efi: Document the copy size trick
    
    We call bi_copymodules twice: once with 0 and once with the size of the
    arena. We do this to find the size, it turns out. Document this.
    
    Sponsored by:           Netflix
    
    (cherry picked from commit 67e39a0d1bdb24967591721bf7c995d61e0e1c2d)
---
 stand/efi/loader/bootinfo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/stand/efi/loader/bootinfo.c b/stand/efi/loader/bootinfo.c
index c5f0291c9e6e..b93f91dfaf15 100644
--- a/stand/efi/loader/bootinfo.c
+++ b/stand/efi/loader/bootinfo.c
@@ -415,7 +415,7 @@ bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp, bool exit_bs)
 #endif
 	bi_load_efi_data(kfp, exit_bs);
 
-	size = md_copymodules(0, is64);
+	size = md_copymodules(0, is64);	/* Find the size of the modules */
 	kernend = roundup(addr + size, PAGE_SIZE);
 	*kernendp = kernend;