On Tue, May 15, 2018 at 07:11:08AM -0700, Nadav Amit wrote: > GCC considers the number of statements in inlined assembly blocks, > according to new-lines and semicolons, as an indication to the cost of > the block in time and space. This data is distorted by the kernel code, > which puts information in alternative sections. As a result, the > compiler may perform incorrect inlining and branch optimizations. > > In the case of objtool, this distortion is extreme, since anyhow the > annotations of objtool are discarded during linkage. > > The solution is to set an assembly macro and call it from the inlinedv > assembly block. As a result GCC considers the inline assembly block as > a single instruction. > > This patch slightly increases the kernel size. > > text data bss dec hex filename > 18126699 10066728 2936832 31130259 1db0293 ./vmlinux before > 18126824 10067268 2936832 31130924 1db052c ./vmlinux after (+665) With what kernel config? What's the text size change for an allnoconfig? -- To unsubscribe from this list: send the line "unsubscribe linux-sparse" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
