| Message ID | a635b5d3e2da044e7b51ec1315e8910fbce0083f.1600417359.git.Tony.Ambardar@gmail.com |
|---|---|
| State | Accepted |
| Delegated to: | BPF Maintainers |
| Headers | show |
| Series | fix BTF usage on embedded systems | expand |
Tony Ambardar wrote: > Systems with memory or disk constraints often reduce the kernel footprint > by configuring LD_DEAD_CODE_DATA_ELIMINATION. However, this can result in > removal of any BTF information. > > Use the KEEP() macro to preserve the BTF data as done with other important > sections, while still allowing for smaller kernels. > > Fixes: 90ceddcb4950 ("bpf: Support llvm-objcopy for vmlinux BTF") > > Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com> > --- > include/asm-generic/vmlinux.lds.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h > index 5430febd34be..7636bc71c71f 100644 > --- a/include/asm-generic/vmlinux.lds.h > +++ b/include/asm-generic/vmlinux.lds.h > @@ -661,7 +661,7 @@ > #define BTF \ > .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ > __start_BTF = .; \ > - *(.BTF) \ > + KEEP(*(.BTF)) \ > __stop_BTF = .; \ > } \ > . = ALIGN(4); \ > -- > 2.25.1 > Acked-by: John Fastabend <john.fastabend@gmail.com>
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 5430febd34be..7636bc71c71f 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -661,7 +661,7 @@ #define BTF \ .BTF : AT(ADDR(.BTF) - LOAD_OFFSET) { \ __start_BTF = .; \ - *(.BTF) \ + KEEP(*(.BTF)) \ __stop_BTF = .; \ } \ . = ALIGN(4); \
Systems with memory or disk constraints often reduce the kernel footprint by configuring LD_DEAD_CODE_DATA_ELIMINATION. However, this can result in removal of any BTF information. Use the KEEP() macro to preserve the BTF data as done with other important sections, while still allowing for smaller kernels. Fixes: 90ceddcb4950 ("bpf: Support llvm-objcopy for vmlinux BTF") Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com> --- include/asm-generic/vmlinux.lds.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)